/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.shardingsphere.core.rewrite.token.pojo;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.collect.Collections2;
import lombok.Getter;

import java.util.Collection;
import java.util.LinkedList;

/**
 * Update encrypt parameter item column token.
 *
 * @author panjuan
 */
@Getter
public final class UpdateEncryptParameterColumnToken extends EncryptColumnToken {
    
    private final Collection<String> columnNames = new LinkedList<>();
    
    public UpdateEncryptParameterColumnToken(final int startIndex, final int stopIndex) {
        super(startIndex, stopIndex);
    }
    
    @Override
    public String toString() {
        Collection<String> items = Collections2.transform(columnNames, new Function<String, String>() {
            
            @Override
            public String apply(final String input) {
                return String.format("%s = ?", input);
            }
        });
        return Joiner.on(", ").join(items);
    }
    
    /**
     * Add update column.
     * 
     * @param columnName column name
     */
    public void addUpdateColumn(final String columnName) {
        columnNames.add(columnName);
    }
}
